| Difficulty | Secondary School | High school/other |
| ★ | Basic | Easy |
| ★★ | Demanding | Basic |
| ★★★ | Demanding | |
| ★★★★ | Difficult | |
| ★★★★★ | Very difficult |
Determine the density of the liquid and the mass of the buret.
Tip: Derive the expression for the added mass as a function of depth and place the observation values (h, m) in the
coordinate system.
coordinate system.
Answer: $m_{buret}=33\ g$; $990\ kg/m^3$